Dog Gone by Cynthia Chapman Willis
Twelve-year-old Dill (short for Dylan) is desperately trying to keep her family from falling apart. Her father is always at work, her mother is gone, and their dog, Dead End, seems to be here one moment and missing the next. And big trouble is brewing. A wild pack of dogs is destroying local livestock and property, and the sheriff has ordered them to be shot. Is this where Dead End has been disappearing to? How far will Dill and her best friend, a boy nicknamed Cub, go to uncover the truth, and hold together the last strands of a family that seems to be unraveling?